Messages in this thread Patch in this message | | | From | John Garry <> | Subject | [PATCH 2/4] scsi: hisi_sas: Modify the commit information for DSM method | Date | Fri, 15 May 2020 22:13:43 +0800 |
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From: Luo Jiaxing <luojiaxing@huawei.com>
Make it clear that BIOS may modify some register settings.
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> --- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index 59b1421607dd..41e07e9f6c8a 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -912,11 +912,15 @@ static int hw_init_v3_hw(struct hisi_hba *hisi_hba) return -EINVAL; } - /* Switch over to MSI handling , from PCI AER default */ + /* + * This DSM handles some hardware-related configurations: + * 1. Switch over to MSI error handling in kernel + * 2. BIOS *may* reset some register values through this method + */ obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, 0, DSM_FUNC_ERR_HANDLE_MSI, NULL); if (!obj) - dev_warn(dev, "Switch over to MSI handling failed\n"); + dev_warn(dev, "can not find DSM method, ignore\n"); else ACPI_FREE(obj); -- 2.16.4
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